1.Key Laboratory of Coalbed Methane Resource & Reservoir Formation Ministry of Education,China University of Mining and Technology,Xuzhou ,China;2.School of Resources and Geoscience,China University of Mining and Technology,Xuzhou ,China

页岩气赋存是页岩气成藏的核心,页岩气主体赋存形式及赋存相态之间的转化、吸附载体的判断及各载体对页岩气吸附的贡献程度尚存争议,特别是黏土矿物在页岩气储层中的吸附特征不明确,给页岩气资源的精确评价带来诸多不确定性。阐述了页岩气赋存相态的转换特征和页岩气吸附载体的吸附性能,指出分子模拟是当前研究页岩气储层中不同吸附载体及其吸附机理的重要方法。未来研究应注重页岩气赋存富集的地质过程,重点在于揭示地质条件上的富气性特征,提高开发技术上的增渗性效率;地质条件上的富气性与页岩气赋存密切相关,其核心在于“甲烷气”和“储集孔”的耦合特性;开发技术上的增渗性与储层本身的渗透性和可改造性密切相关,关键在于“连通性”和“可改造性”的适配。分子模拟技术可以从分子层面解释页岩气吸附机理,对页岩气的赋存与富集特征进行本质性揭示,可以弥补试验方法对页岩气储层吸附研究的不足,为完善页岩气地质理论提供一种有效方法。

The occurrence of shale gas is the core of shale gas accumulation.There are a series of problems with shale gas development in the main occurrence form,occurrence phase transformation,judgment of the adsorption carrier,and the contribution of each carrier to shale gas adsorption.It is not clear understanding of the adsorption mechanism and contribution of clay minerals in the shale gas reservoir.All of these problems bring a lot of uncertainty to the precise evaluation of shale gas resources.This paper describes the transformation characteristics of shale gas and the adsorption properties.It is pointed out that molecular simulation is an important and effective method for studying different adsorption vectors and their adsorption mechanisms in shale gas reservoir.The future study should focus on the geological process of the shale gas enrichment.And the key study would be on the gas enrichment of geological conditions and permeability of development technology.The geological condition is closely related to the occurrence of shale gas.The key factor is the coupling characteristics of methane gas and reservoir pore.The permeability of development technology is closely related to the permeability of the reservoir itself and the reconstruction of the reservoir.The good reservoir key characteristic lies in the adaptation characteristics of connectivity and scalability.Molecular simulation can explain the adsorption mechanism of shale gas at the molecular level,and can reveal the nature property of occurrence and enrichment of shale gas.It can well compensate for the lack of conventional experimental research on shale gas reservoir adsorption,and provide an effective method to make shale gas geology theory perfect.